Inferior = Bottom
Superior = Top
Anterior = Front
Posterior = Rear
Trans = Through or Across
Mural = Wall
Infarction, or infarct, is an area that was deprived of circulation. Small Transmural Infarct is an area that extends through the heart wall that was damaged by lack of adequate blood circulation.
I'd trust your cardiologist or doctor to explain the significance to you, sometimes, readings and interpretations are not always what they appear, many people have needlessly worried about test results. I just read one about an EKG that showed one symptom, the Echo Test saying no problem existed. The EKG interpreter even suggested the Echo tech didn't know what they were doing, it was subsequently discovered that the Echo tech was correct.
I think you mean an Infarct. An infarct is basically a heart attack. The clot starved a portion of your heart from blood, and the muscle tissue was damaged.